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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
As we sleep, we pass through one stage then another, from non-REM to REM, then repeat the cycle throughout the night. After about 70 minutes of non-REM sleep, we head into our first, brief 5 minutes or so of REM sleep. Then we switch back to non-REM, and again back to REM. Each time, the non-REM time becomes shorter while the REM time expands.